Open the cheat menu by getting five DK coins. The cheat menu is in the "Extras" section.

Unlockable	How to unlock
Choose between 5 or 20 lives after game over	5 DK Coins.
Crystal Stars cheat	Collect 25 DK Coins.
Developer records for Challenge mode	Get an AAA rank for each level of any Challenge mode mini-game.
Make Diddy's hammer swing faster	10 DK Coins.
Torch Power-up Cheat	Collect 20 DK Coins.
Wing Power-up Cheat	Collect 15 DK Coins.